<template>
	<view>
		<view class="search-box">
			<my-search @click="gotoSearch"></my-search>
		</view>
		<view class="scroll-view-container">
			<!-- 左侧的滚动视图区域 -->
			<scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
				<block v-for="(item,i) in CateList" :key="i">
					<view :class="['left-scroll-view-item',i===active?'active':''] " @click="activeChanged(i)">
						{{item.cat_name}}
					</view>
				</block>
			</scroll-view>
			<!-- 右侧的滚动视图区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<block v-for="(item2,i2) in CateListTow" :key="i2">
					<view class="cate-tow-title">/{{item2.cat_name}}/
						<!-- 商品牌子区三级分类 -->
						<view class="cate-free">
							<!-- 三级分类 Item 项 -->
							<view class="cate-free-item" v-for="(item3, i3) in item2.children" :key="i3"
								@click="gotoGoodsList(item3)">
								<!-- 图片 -->
								<image :src="item3.cat_icon.replace('dev','web')"></image>
								<!-- 文本 -->
								<text>{{item3.cat_name}}</text>
							</view>
						</view>
					</view>
				</block>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	// 导入自己封装的 mixin 模块
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		// 将 badgeMix 混入到当前的页面中进行使用
		mixins: [badgeMix],
		data() {
			return {
				wh: 0,
				// Cate数据一级分类
				CateList: [],
				// Cate数据二级分类
				CateListTow: [],
				// 滚动条距离顶部的距离
				scrollTop: 0,
				active: 0
			}
		},
		onLoad() {
			// 获取当前系统的信息
			const sysInfo = uni.getSystemInfoSync()
			// 为 wh 窗口可用高度动态赋值
			this.wh = sysInfo.windowHeight
			this.getCateList()
		},
		methods: {
			// 获取Cate数据
			async getCateList() {
				const { data: res } = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) {
					return uni.showMsg()
				}
				uni.showMsg('数据加载成功', 500)
				// 一级分类数据
				this.CateList = res.message
				// 二级分类数据
				this.CateListTow = res.message[0].children
				console.log(this.CateList)
				console.log(this.CateListTow)
			},
			// 点击左边的红色条子变化事件
			activeChanged(i) {
				this.active = i
				this.CateListTow = this.CateList[i].children
				// 重置滚动位置
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			// 点击商品品牌导航到商品列表页面
			gotoGoodsList(item3) {
				uni.navigateTo({ url: `/subpkg/goods_list/goods_list?cid=${item3.cat_id}` })
			},
			// 跳转到搜索页面
			gotoSearch() {
				uni.navigateTo({ url: '/subpkg/suoshou/suoshou' })
			}
		},
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				line-height: 60px;
				background-color: #f7f7f7;
				text-align: center;
				font-size: 12px;

				// 激活项的样式
				&.active {
					background-color: #ffffff;
					position: relative;

					// 渲染激活项左侧的红色指示边线
					&::before {
						content: ' ';
						display: block;
						position: absolute;
						left: 0;
						top: 50%;
						transform: translateY(-50%);
						width: 3px;
						height: 30px;
						background-color: #C00000;

					}
				}
			}
		}

		.cate-tow-title {
			font-size: 12px;
			font-weight: 700;
			text-align: center;
			padding: 15px 0;

			.cate-free {
				display: flex;
				flex-wrap: wrap;

				.cate-free-item {
					width: 33.33%;
					margin-bottom: 10px;
					display: flex;
					flex-direction: column;
					align-items: center;

					image {
						width: 60px;
						height: 60px;
					}

					text {
						font-size: 12px;
					}

				}
			}
		}
	}
</style>
